This is a location-based treasure hunt, released as an iPhone app that works in London. Players have to solve seven photo-puzzles a month that will lead them to the virtual treasure, with the idea being that they are encouraged to visit landmarks around the UK capital. The game is running from May until August, with monthly prizes of £1,000 and a grand prize of £5,000.

Should the makers of Angry Birds be worried? Ad Block is an Android app that claims to do just that: block adverts. It does that by automatically turning off the handset's internet connection when launching an app that the user has designated as requiring ad-blocking, before switching the connection back on when they close it. Initial reviews on Android Market suggest it works with Angry Birds, which is ad-funded on Android.

Fox Mobile Entertainment's new Family Guy iPhone app doesn't offer full episodes. Instead, it's all about promoting sales of the shows on Apple's iTunes Store, with short clips refreshed every day, and sharing features to pass them on to friends. US-only at the time of writing.

US broadcaster PBS has launched what it describes as a "safe, child-friendly viewing experience" for iPad. Users can browse and watch videos from more than a dozen of PBS's TV shows, including Sesame Street. Videos stream over 3G or Wi-Fi, and are a mix of education and entertainment.

Vintage children's TV brand Ivor the Engine has returned in the form of an iPhone game (there is a separate iPad version), which presents a series of puzzles based on the Merioneth and Llantisilly Rail Traction Company. It still trips off the tongue after all these years. The app includes narration from the late Oliver Postgate too.

It must be the day for iOS apps focusing on popular train-based TV shows for kids. Callaway Digital Arts' latest Thomas the Tank Engine title is a book-app, mixing animation, games, puzzles and finger-painting. It follows a previous Misty Island Rescue app based on HIT Entertainment's brand.

This app could be controversial for record labels. It's free and available for iPhone and iPad, and makes it easy for people to share their iPod music libraries with friends. Users can email individual tracks, or import their collection into the app, which then generates an IP address from which someone on a nearby computer can download them.

iPhone game KickAR claims to be 'the first augmented reality football game', with 10 challenges making use of the device's camera. Note, you'll have to download and print out an AR marker from the developer's website before playing.

Book-app developer Loud Crow Interactive's latest iPad app takes Beatrix Potter's Squirrel Nutkin book and gives it a pop-out tablet spin, following in the footsteps (pawprints?) of its previous Peter Rabbit app. US-only at the time of writing.